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Then Open the Map that you wanted to Import.
So I'm gonna select Pallet Town as the Map that I'm going to Import. Now go to Header and press Ctrl+H.
Now take note of this things that I encircled.
So PALLET TOWN's Height and Width is 24x20 and the Map Offset is at offset 0x2DD100
Next is Open up your Calculator. (Take note of this.)
Then multiply 24 by 20. (You may not need the Calculator and you may do it manually, but I'm too lazy to do that.) Mine says 480.
Then Multiply it by two since one block in a map is two bytes. Now It's 960
Take note of it 960. Now open up your Hex Editor and goto your Map Offset mine is 0x2DD100 so I'll be going there...
Now goto Edit then Select Block.
Now be sure to have selected "dec" and type in the result you got earlier. Mine was 960 so type in 960. Then Press Ok. Now Copy it by just simple pressing Ctrl+V. And make sure you paste it somewhere like Notepad.
Now Open up the Rom that you wanted to Import your Maps with A-map.
Then Go to the Map that you wanted to Replace. For me it will be VIRIDIAN CITY.
Now the things that I encircled are the one's that we're gonna be changing...
Imagine that the PALLET TOWN MAP is nowhere in the ROM. We're just going to repoint where it loads the data. Now change the Height, Width, Tilesets just like the Map you wanted to Insert.
Now let's find some free space where we can put our map. I'll be using 0xA00000 (You can use any offset you like as long as it has enough free-space on it.) Now Open the Rom with your Hex Editor. And goto to 0xA00000.
Then Paste it using Paste Write or simply Ctrl+B.
Click Save
Open the ROM in A-Map and see if it's changed. Be sure to have everything changed in A-map.
Happy Hacking...

Credits:
LU-HO

If you didn't understand anything or have anymore further questions just contact me via VM/PM.

Just wondering, is it possible to import an emerald map into fire red? Let's say I want to insert Littleroot into a fire red rom, can I then create a new map, save it and then just paste littleroot into the game the way you just did it? If not, is this impossible using the fire red rom, or do you need to do a ****load of tile- and palettework?

Just wondering, is it possible to import an emerald map into fire red? Let's say I want to insert Littleroot into a fire red rom, can I then create a new map, save it and then just paste littleroot into the game the way you just did it? If not, is this impossible using the fire red rom, or do you need to do a ****load of tile- and palettework?

For you to import Littleroot town to Fr, I think you need to import the RSE Tile System to FR with all the tilesets and the palletes. And I think it should work if you try to import the code from Emerald to FireRed. Though I'm not sure if the codes are the same.

Is there a way to import FireRed tiles into Emerald? I'm trying to make a hack for Emerald and can't seem to find a good way of importing hundreds of tiles. I could do it manually but that'd take ages.

Is there a way to import FireRed tiles into Emerald? I'm trying to make a hack for Emerald and can't seem to find a good way of importing hundreds of tiles. I could do it manually but that'd take ages.

You can just directly insert a map with advance map 1.90. I'm not sure if the download is available anymore, but it supports this kinda work without the hex editing. Only drawback is that the multi-tile select mapping crashes your ROM with 1.90. As such, I use 1.90 for inserting maps and a newer version for actual mapping :)

EDIT:
I just thought I'd share that, but if you're forgetful and accidentally map on 1.90 then you're gonna have a bad time (most of the time). In which case, this tutorial is the way you should probs do it :)

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My name forum name is FBI Agent, though you can call me FBI because it's shorter.

You can just directly insert a map with advance map 1.90. I'm not sure if the download is available anymore, but it supports this kinda work without the hex editing. Only drawback is that the multi-tile select mapping crashes your ROM with 1.90. As such, I use 1.90 for inserting maps and a newer version for actual mapping :)

EDIT:
I just thought I'd share that, but if you're forgetful and accidentally map on 1.90 then you're gonna have a bad time (most of the time). In which case, this tutorial is the way you should probs do it :)

Let's say I want to take a map from a newer gen. Could I make my own Sandgem map, then replace Virdian with that? (Think of me as an expert mapper, even though i'm not)
If it can't be done plz tell me, cuz i don't want to ask someone to help me do something impossible.

Let's say I want to take a map from a newer gen. Could I make my own Sandgem map, then replace Virdian with that? (Think of me as an expert mapper, even though i'm not)
If it can't be done plz tell me, cuz i don't want to ask someone to help me do something impossible.

So it would work if I made my own map? I wanted to know because I plan on replacing all of the Sevii islands with the Sinnoh regions. I would rather copy and paste someone else's work and give them credit, because I REALLY don't like mapping. I prefer scripting and HEX editing. They're so much easier for me.

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